Windmill.



PATENTE) APR. 7 '1906,

'Noe 818,013.

R. s. BARTLETT.

WINDMILL.

APPLIUATION PILBDxooT.4.19o5.

2 SHEETS-SHEET 1.

PATENTE) APB.. 17, 1906.

R. S. BARTLBTT.

WINDMILL.

APPLICATION FILED 001211905.

2 SHEETS-SHEET 2,

wh/masas Nomils PETERS. INC.. Ln'hp.. WAsmNsTuN. D. C.

UNTTED STATES PATENT OFFICE.

-` `ROBERT S'. BARTLETT, 0F NOCONA, TEXAS. ,i

WINDMILL.

To (1N ich-0711' it may concern:

ABe it known that I, ROBERT S. BARTLETT,

av citizen l of the United States, residing at iN ocona, in the countyof Montague and State of Texas, have invented certain new and usefulImprovements in Yindmills, of-which the lwind-wheel produces a maximumvelocity with a minimum of wind.

'ith this and other object-s in view the in'-l vention comprises,primarily. a peculiar construction of wind-wheel which is not proi videdwith any vane and in which the blades are so constructed and arrangedthat the wind will act thereon to the best possible advantage. y

For a full description of the invention and the merits thereof and alsotoacquire a knowledge of the details of construction lof the means foreffecting the result reference is to be had tothe following descriptionand accompanying drawings, in which .A Figure l is a perspective view.Fig. 2 is a horizont-al section taken through the windwheel. Fig. 3 is asimilar view taken through the 'tower structure just above theA bra-kedevice.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views ofthe drawings by the samereference characters.

Referring' to the drawings, the referencenumeral 1 designates a suitabletower structure in which is mounted a vertical shaft 2,

designed to drive a pump ora-ny other de sired device. The 'upper end ofthe shaft 2 projects above the top of the tower, and upon said sha-ft ismounted my improved win'lwheel 3, which comprises lupper and lowerhorizont ally-disposed heads 4;, between which are rigidly secured aplurality of longitudinally-extending blades 5. The blades 5 arerelatively narrow and do not extend with their inner edges to the centerofthe wheel, but are' of such `width that they provide within the wheelbetween the circle of the blades an open space or wind-chamber 6. In

' the present instan'ce'there are eight of these blades provided, andeach blade has a concave-convex form m erom-section, as shownSpecification of lI etters Patent.

I Application filed October 4, 1905. SerialvNo. 281,344i

Patented April' 1.7, 190e. i.

in Fig. 2. To properlylset this number' of blades and to insure thattheir cross-sections shall assume the proper form to secure the bestresults, two concentric circles are struck in the heads, the innermostcircle indicating the transverse area of the interior air-space orwindechamber before described. Then arcs arev struck from left to right,with the compasses set one-half the diameterof the wheel, said arcsbeginning at the outside circle at t-he point it is desired the outeredge of' each blade shall come and touching the inside circle at thepoint where section-lines drawn through the two circles and dividing thesaine into eight parts will cross the innermost circle. In other words,in laying the plan for the wheel the outer circumference ofl the wheelbeing determined said circumference will bel divided into eight partsfor eight blades, said parts being designated by sec-tionlines passingthrough the center of the circle.

Where each of these lines cuts the outer circle the outer edge of theblade is intended to be located, and to determine the propercross-sectional shape of each blade and the proper location for theinner edge thereof the compasses are, as before described', set adistance apart equal to one-qliiarter the diameter of the outer circle,so t at in striking from left to right the before-mentioned arc will bedesignated, beginning at the outside circle at thepoint where thesectional line crosses the same and passing across and in tersecting theinside circle where the next sectional line crosses the latter. Theblades are then formed and set to'fit these arcs.

The shaft of the windmill is provided with suitable ball-bearings ofother antifriction devices, so as to 'reduce friction as much aspossible. At some convenient point within the tower structure thevlatter is rovided with two cross-beams 7, t0 one ofw iich twocorresponding brake-levers 8 are fulcrumed together by a hinge-joint orthe like, the free ends of said brake-levers being secured Itogether bya rope or cable 8, designed to wind about a spindle 9, as shown, saidspindle being provided with a hand-wheel 10 for the actuation thereofand being provided also with a ratchetand pawl l1. The brake-levers areprovided,further, with concave cheeks 12 fitting around opposite sidesof the drum 13, secured on the shaft 2, so that by manipulation of thespindle 9 said brake-levers may be brought together to bear upon saiddrum,

thereby constituting a 'brake for the shaft.

IOO

so. p

The paw] sarranged so that it may be disengaged from its ratchet by, anysuitable means, so as to release the brake-levers when desired. The mainfeature of my invention resides 1n the peculiar construction andarrangement 0f the wind-wheel.- 'A

In the opera-tion of the device the blades of the Wind-wheel beingconstructed'and arranged as before described the wind may enter theWheel from any point and start acting agalnst the Windward blades ontheir concave sides and then pass into the Windchamber-and inside thecircle of the blades after acting upon the most leeward blades, and alsowill react on the opposite sides of the blades which were initiallyWindward ones. the circle of the lblades asin a' vortex and will drivethe wheel with maximum velocity.

To arrive at a proper understanding ofthe advantageous results arisingfrom the num'- ber and construction'of blades hereinbefore described,reference is to be particularly had to Fig. 2 of the drawings, whichincludes with the features of construction shown a diagrammaticportrayal which Lshall nowv describe. The space from A to"-B shows thevolume ofwind as it strikes the wheel. Arrow N o'. 1 re resents thedirection in which the wheel Wi 1 revolve, and arrow No.2 indicates thedirection of the wind. The parl` ticular construction of blades producesby the curvature of said blades a shield that will throw off the windthat strikes the righthand side of the wheel; otherwise this wind wouldgreatly retard the motion. The reference-letter X' indicates the ointsfrom `which to the outer circle the bla 'es form the shield as theblades `come around to the righthand side of the wheel. D indicates bythe dotted Yline the line to be drawn through the center yofthe wheel,beginnin at the outer edge of the blade a, then. touc 'ng the inner endof blade h, also the inner edge of blade d and the outer edge of bladee. Similar lines are drawn across the wheel, so that it is di vided intothe eight sections, as beforel de scribed. Now the position of theblades laced on these sections lpartly -forms the shield beforementioned on the right-hand side of the wheel an'd also forms theopening In this manner the Wind acts within to receive the wind ontheleft-hand side.

Furthermore, this same position of blades feeds the Wind received intothe Wheel to the blades that are at the right-hand side and sistance onthe right-hand side of the wheel Again, if the cur.-

and, retard the' motion. vature is greater than that, described with myinvention it will-to some extent'choke the left-hand side of the wheelthat receives the wind, thereby also retarding the motion and lesseningthe force or working power of the wheel.v The blades are individuallydistinguished from each other by reference-letters a b c d @fg It is ofcourse to be understood that the wheel may be made of anyI length anddiameter.

Having thus described the invention, what is claimed as new is- Awind-wheel comprising spaced-apart heads, a circular series oftransversely-curved vblades secured to said heads and heldtherebetween,the outer edges of said blades being arranged in a circle `and the inneredges of saidsblades being also arranged in an inner vcircle whichforms' a wind-chamber at the 'center of thewheel, the inner edge of eachcurved blade being located at a point where' a line drawn therethroughand through the center of the Wheel will intersect the. outer edge ofthe next blade in advance, and each of said bladesl being concavo-conveXin crosssection, the cross-sect1on thereof lying 1n an arc struck fromthe outer circle of the wheel to the inner circle forming theWind-chamber,

the radius of said arc being e ual to onequarter vthe diameter of thewhee In testimony whereof I alix my signaturel in presence of twoWitnesses.

ROBERT S. BARTLETT.

Witnesses: v

vV. Y..WooD,

C. A. MORRIS

